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<?php
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namespace PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
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use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
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use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
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use PhpOffice\PhpSpreadsheet\Cell\Cell;
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class Formula
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{
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    /**
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     * FORMULATEXT.
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     *
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     * @param mixed $cellReference The cell to check
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     * @param ?Cell $cell The current cell (containing this formula)
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     */
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    public static function text(mixed $cellReference = '', ?Cell $cell = null): string
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    {
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        if ($cell === null) {
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            return ExcelError::REF();
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        }
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        $worksheet = null;
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        if (1 === preg_match('/^' . Calculation::CALCULATION_REGEXP_CELLREF . '$/i', $cellReference, $matches)) {
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            $cellReference = $matches[6] . $matches[7];
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            $worksheetName = trim($matches[3], "'");
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            $worksheet = (!empty($worksheetName))
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                ? $cell->getWorksheet()->getParentOrThrow()->getSheetByName($worksheetName)
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                : $cell->getWorksheet();
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        }
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        if (
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            $worksheet === null
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            || !$worksheet->cellExists($cellReference)
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            || !$worksheet->getCell($cellReference)->isFormula()
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        ) {
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            return ExcelError::NA();
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        }
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        return $worksheet->getCell($cellReference)->getValue();
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    }
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}